martinvonk/SPEI

Invalid frequency: ME

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I have daily precipitation data. I followed the steps in the examples, but I faced this error: 'Invalid frequency: ME'. I appreciate it if you guide me about the possible problem. 

This is probably related to your pandas version. Pandas updated its frequency aliases recently: https://pandas.pydata.org/pandas-docs/stable/user_guide/timeseries.html#offset-aliases